Troubleshooting Swing Decrease in AUX Signal Passed through TUSB1064

The task involves analyzing swing levels of AUX signals before and after passing through TUSB1064 in different setups with varied voltage readings. The swing levels of AUX signals are found to differ based on the source devices, necessitating further investigation to ascertain the validity of the results obtained.

• Troubleshooting
• Swing Decrease
• AUX Signal
• TUSB1064
• Voltage Readings

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1. Problem : decrease the swing of AUX after pass through TUSB1064 06-July-2023 Y.Nakanishi Main block PCB A Main block PCB B Converter Block from DP to USB typeC 3.3V 3.3V 3.3V USB Displayport ALT Mode Re-driver TUSB1046 USB Displayport ALT Mode Re-driver TUSB1064 PC 1M 100k DP-MIPI converter DP repeater 1M Type-C Type-C Type-C Port Protector Connector(DP Alt) Connector(DP Alt) 0.1uF AUXRX_P SBU1 Dp SBU1 0.1uF 0.1uF AUXRX_N SBU2 SBU2 Dn USB type C Cable DP cable 0.1uF 0.1uF 0.1uF 100k 1M 1M 2Mohm 2Mohm Test Point Test Point Test Point Test Point Test Point Before DP-Retimer point After DP-Retimerpoint Before After TUSB1064 point Before VXR7200 point No. PC TUSB1064point 3m cable with ELSA DT2 RTX4090 Driver : 535.98 1 512 mV 528 mV 392 mV 444 mV 300 mV 3m cable with G-Tune RTX4080 Driver : 528.02 2 520 mV 528 mV 388 mV 432 mV 304 mV Increased the swing level of Aux+/Aux- from Before TUSB1064 to after TUSB1064. Last time, the swing level was reduced. 3m cable with OMEN Obelisk desktop with A6000 Driver : 531.41 3 560 mV 532 mV 392 mV 424 mV 300 mV I m not sure what is happen. 3m cable with OMEN Obelisk desktop 4 500 mV 536 mV 392 mV 440 mV 288 mV NVIDIA RTX 2080 Driver Ver 531.41 I d like to ask you to give us comment whether the result is valid or not. 3m cable with ALIEN WARE 5 536 mV 532 mV 396 mV 448 mV 288 mV NVIDIA RTX 2080 Driver Ver 531.41 3m cable with Laptop ELSA VELUGA 6 380 mV 532 mV 384 mV 440 mV 304 mV A5000, driver : 531.41 3m cable with Laptop OMEN 17-ck1009TX 7 420 mV 532 mV 396 mV 436 mV 300 mV RTX3070, Driver : 532.03 3m cable with Laptop OMEN 17-ck1009TX with Rev A 8 436 mV 508 mV 380 mV 428 mV 292 mV RTX3070, Driver : 532.03 3m cable with Laptop OMEN 17-ck1009TX with Rev A w/o 2Mohm 9 420 mV 512 mV 376 mV 432 mV 300 mV RTX3070, Driver : 532.03

2. Problem : decrease the swing of AUX after pass through TUSB1064 10-May-2023 Y.Nakanishi 2.6144V by digital multimeter 0.23962V by digital multimeter 0.24016V by digital multimeter Main block Converter Block from DP to USB typeC 2.613V by digital multimeter 3.3V 3.3V 3.3V USB Displayport ALT Mode Re-driver TUSB1064 PC USB Displayport ALT Mode Re-driver TUSB1046 1M 100k DP-MIPI converter DP repeater 1M Type-C Type-C Type-C Port Protector Connector(DP Alt) Connector(DP Alt) 0.1uF AUXRX_P SBU1 Dp SBU1 0.1uF 0.1uF AUXRX_N SBU2 SBU2 Dn USB type C Cable DP cable 0.1uF 0.1uF 0.1uF 100k 1M 1M 2Mohm 2Mohm The 100kohm is put before TUSB1046. ( it is NOT TUSB1064). There is NO 100kohm before and after TUSB1064. Do I need to put 100k before or after TUSB1064? FLIP pin : 3.4384V CTRL0 : 0V CTRL1 : 3.4385V Before DP-MIPI converter Measured the swing level ( eye diagram ) Before DP-Retimer After DP-Retimer Before TUSB1064 After TUSB1064 measured by Laptop OMEN 17-ck1009TX 424 mV 492 mV 400 mV 348 mV 276 mV measured by Desktop PC OMEN Obelisk desktop 516 mV 528 mV 420 mV 380 mV 296 mV The swing level is different depending on source device.

3. Problem : decrease the swing of AUX after pass through TUSB1064 21-April-2023 Y.Nakanishi Check the voltage before input to TUSB1064(Positive) Check the voltage output from TUSB1064 (Positive) VAUXP(output from TUSB1064) VAUXP(output from TUSB1064) SBU(before input to TUSB1064) SBU(before input to TUSB1064) The voltage is 0.232V Center 0.116V The voltage is 0.244V Center 0.122V Check the voltage before input to TUSB1064(Negative) Check the voltage output from TUSB1064 (Negative) SBU(before input to TUSB1064) VAUXN(output from TUSB1064) VAUXN(output from TUSB1064) SBU(before input to TUSB1064) The voltage is 2.54V 2.78V Center 2.66V The voltage is 2.61V 2.83V Center 2.72V

4. Problem : decrease the swing of AUX after pass through TUSB1064 18-April-2023 Y.Nakanishi Measured before TUSB1064 It is measured by differential probe for AUX positive and negative 400mV 400mV Measured after TUSB1064 It is measured by differential probe for AUX positive and negative 348mV 348mV